I'm not pretending that I'm great at this, but sometimes it helps to say to myself "what is happening right now?". I usually find that the intolerable part of my experience isn't what's happening right now, it's my thoughts about the past/future. Then sometimes I can choose to challenge those thoughts.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712